MDA's Second Quarter 2010 results conference call alert

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, plans to release its Second Quarter 2010 financial results at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time) on July 29, 2010.

MDA will host an earnings conference call, featuring remarks by Daniel Friedmann, president and CEO and Anil Wirasekara, executive vice-president and CFO, followed by a Q&A session.

The call is scheduled to begin promptly at 5:30 p.m. Eastern Time (2:30 p.m. Pacific Time).

To participate, please call the conference line approximately five minutes prior to the commencement of the call:

About MDA

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

Related Websites:
www.mdacorporation.com

Forward-Looking Statements
This press release and the Second Quarter 2010 financial results conference call and webcast may contain certain forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. (“MDA”) with respect to future events and financial performance. Forward-looking statements generally can be identified by the use of forward-looking terminology such as "may", "will", "expect", "intend", "anticipate", "plan", "foresee", "believe" or "continue" or the negatives of such terms or variations of them or similar terminology. Any such forward-looking statements are based on MDA's current expectations, estimates, projections and assumptions made in light of its experience and its perception of historical trends. Any such forward-looking statements are subject to risks and uncertainties and MDA’s actual results of operations could differ materially from historical results or current expectations. You are referred to the risk factors described in MDA's most recent annual Management's Discussion and Analysis, Annual Information Form and other documents on file with the Canadian securities regulatory authorities, available online at www.sedar.com or www.mdacorporation.com. The forward-looking statements and information contained in this press release represent MDA’s views only as of today’s date. MDA disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, other than as required by law, rule or regulation. You should not place undue reliance on forward-looking statements.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.